GB994967A - Improvements in or relating to signal clipping circuit arrangements - Google Patents
Improvements in or relating to signal clipping circuit arrangementsInfo
- Publication number
- GB994967A GB994967A GB1521/61A GB152161A GB994967A GB 994967 A GB994967 A GB 994967A GB 1521/61 A GB1521/61 A GB 1521/61A GB 152161 A GB152161 A GB 152161A GB 994967 A GB994967 A GB 994967A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diodes
- conductive
- waveform
- inverted
- clipping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/165—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/18—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
- H04N5/185—Circuitry for reinsertion of DC and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit for the black level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Picture Signal Circuits (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
994,967. Television; limiters. MARCONI CO. Ltd. Nov. 1, 1961 [Jan. 13, 1961], No. 1521/61. Headings H3W and H4F. A clipping circuit comprises a pair of diodes connected in series opposition between the input and output terminals, the voltage at the junction of the diodes being inverted and passed by a cathode follower to the output terminal. In Fig. 1 the D.C. level of a television waveform at the grid of a cathode follower V1, is clamped to the voltage at the slider of RV1 under control of pulses fed to diodes D1, D2. RV1 is adjusted so that the clipping diode D3 is conductive during the negative-going video waveform but non-conductive during the positive-going synchronizing pulses. The video waveform is inverted by V3 and passed by a cathode follower V2 to the output line. Diode D4 is conductive during the time D3 is non- conductive, the changeover of conductive states of the diodes being made more definite by the effect of the inverted waveform from V3. The clipping level is adjustable by variation of RV1 or RV2. V3 and V2 may be coupled via a direct current path. In Fig. 3 (not shown) the loading on cathode followers V1, V2 is made constant by a further pair of diodes connected in series opposition across D3, D4 but with reversed polarity.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1521/61A GB994967A (en) | 1961-01-13 | 1961-01-13 | Improvements in or relating to signal clipping circuit arrangements |
| US161193A US3221258A (en) | 1961-01-13 | 1961-12-21 | Signal clipping circuit arrangements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1521/61A GB994967A (en) | 1961-01-13 | 1961-01-13 | Improvements in or relating to signal clipping circuit arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB994967A true GB994967A (en) | 1965-06-10 |
Family
ID=9723424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1521/61A Expired GB994967A (en) | 1961-01-13 | 1961-01-13 | Improvements in or relating to signal clipping circuit arrangements |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3221258A (en) |
| GB (1) | GB994967A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1024168A (en) * | 1964-02-17 | 1966-03-30 | Marconi Co Ltd | Improvements in or relating to amplitude clipping circuit arrangements |
| US4242640A (en) * | 1978-01-03 | 1980-12-30 | Sperry Corporation | Current discharge fast time constant amplifier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2859344A (en) * | 1952-06-04 | 1958-11-04 | Gen Electric Co Ltd | Electrical pulse slicing circuit |
| US2890335A (en) * | 1956-10-30 | 1959-06-09 | Monroe Calculating Machine | Signal slicing circuits |
| US3052850A (en) * | 1957-07-02 | 1962-09-04 | Frederick R Fluhr | Switching circuit having transient signal minimizing means |
| US3009110A (en) * | 1959-02-03 | 1961-11-14 | Benjamin R Cole | Voltage limit control circuit |
-
1961
- 1961-01-13 GB GB1521/61A patent/GB994967A/en not_active Expired
- 1961-12-21 US US161193A patent/US3221258A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3221258A (en) | 1965-11-30 |
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